Epileds 5050 (XM-footprint) high power red led, short post with test results.

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djozz
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Epileds 5050 (XM-footprint) high power red led, short post with test results.

https://nl.aliexpress.com/item/5PCS-5050-Epileds-XML-XM-L-T6-LED-10W-High-Power-LED-Red-Green-Blue-UV/32840392031.html?spm=a2g0s.9042311.0.0.27424c4dRWj25k

I stumbled upon these a few months ago and did an output test on one, but because the performance is not that great the urge to make it public was not high. In another thread Flash Tom asked about it so here are the raw measurements at least.

The die is larger than the XP-E2 and the output colour looks exactly the same. Here is a picture next to an ancient red XP-E (same size as XP-E2), to get an idea of the size.

Here are the numbers, I re-tested a red XP-E2 next to it because it was two years ago that I tested it, and the results to my contentment are virtually the same.

So, as I announced, despite the considerably larger die (2x ?), this led performs just a littlebit better (from 2A on). I now see that the voltage is quite a bit lower than the XP-E2, that adds to the efficiency, I may have underestimated this led a bit. And they are not expensive and should make a nice 12-led SRK-clone red monster.

Edited by: djozz on 06/21/2018 - 12:50
CRX
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Thanks Beer

MRsDNF
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Yep, Thanks also. I’ve been using the red XPE2 for awhile now in B158’s. Thanks to your tests I know what current to drive them at. Thumbs Up

 

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Thank you very much djozz! I‘m already enthusiastic about trying out this LED in some hosts. Smile

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Have you tried de-doming them? I know with the cheap Chinese knock-off emitters, chemical de-doming is sometimes super difficult, if not impossible. Maybe slicing?

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djozz
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DavidEF wrote:
Have you tried de-doming them? I know with the cheap Chinese knock-off emitters, chemical de-doming is sometimes super difficult, if not impossible. Maybe slicing?

There have been talk about and attempts at dedoming colour leds before, with no clear gains. Whatever is the plain optical benefit of removing the dome (like a possibly better behaviour in TIR optics), these dies do not have a phosfor layer that can re-excited by reflected blue light so the added luminance increase of photon recycling is not there.
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djozz wrote:
DavidEF wrote:
Have you tried de-doming them? I know with the cheap Chinese knock-off emitters, chemical de-doming is sometimes super difficult, if not impossible. Maybe slicing?

There have been talk about and attempts at dedoming colour leds before, with no clear gains. Whatever is the plain optical benefit of removing the dome (like a possibly better behaviour in TIR optics), these dies do not have a phosfor layer that can re-excited by reflected blue light so the added luminance increase of photon recycling is not there.

I would have thought there would be some gain from a smaller apparent die size.

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Thanks for the hard work mate!

The bigger LED size would have a better look in a floody reflector light?

djozz
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everydaysurvivalgear wrote:
Thanks for the hard work mate!

The bigger LED size would have a better look in a floody reflector light?


I have not checked but the die size is still not big, as small as XP-G or 219C, should work in any reflector. The die not square, I wonder if that has any influence on the beam (my guess: not)
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djozz wrote:
everydaysurvivalgear wrote:
Thanks for the hard work mate!

The bigger LED size would have a better look in a floody reflector light?


I have not checked but the die size is still not big, as small as XP-G or 219C, should work in any reflector. The die not square, I wonder if that has any influence on the beam (my guess: not)

Since you said it is as small as XP-G or Nichia 219C…would this LED fit under the Carclo lens of the Astrolux S41? I’m not really sure about it but I like the idea of an S41 Quadruple Red with about 2300-2400 lumens of red light when overdriving the LEDs to 4 amps each. Is this current still okay for frequent usage or do you think there’s a better optimal current/output ratio?

djozz
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No, the die is smaller than an XM-L but the dome is just as big, doubt it will fit under a Carclo or S41 quad TIR and AFAIK there is also not an XM footsprint triple or quad board available.